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Role of a DNA damage checkpoint pathway in ionizing radiation-induced glioblastoma cell migration and invasion

Issai Vanan1, Zhiwan Dong, Elena Tosti

  • 1Oncology and Cell Biology Center, The Feinstein Institute for Medical Research, Manhasset, NY, USA.

Cellular and Molecular Neurobiology
|May 4, 2012
PubMed

Insights

Ionizing radiation (IR) stimulates glioblastoma cell invasion via a novel pathway involving Nbs1, MRK, and Chk2. Blocking cell cycle progression reverses this IR-induced invasive behavior.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Ionizing radiation (IR) triggers DNA damage responses and cell cycle arrest.
  • IR can also enhance the invasiveness of glioblastoma cells.
  • The role of specific proteins in IR-induced invasion is not fully understood.

Purpose of the Study:

  • To investigate the signaling pathway mediating IR-induced migration and invasion in glioblastoma cells.
  • To identify key proteins involved in this process.
  • To understand the interplay between cell cycle progression and IR-induced invasiveness.

Main Methods:

  • RNA interference (RNAi) to deplete specific proteins.
  • Analysis of cell migration and invasion assays.
  • Western blotting to assess protein activation and interactions.
  • Pharmacological inhibition of cell cycle regulators.

Main Results:

  • The protein kinase MRK inhibits IR-induced glioblastoma cell migration and invasion.
  • MRK activation by IR requires the checkpoint protein Nbs1, which is also essential for IR-stimulated migration.
  • MRK acts upstream of Chk2, another protein required for IR-stimulated migration and invasion.
  • Inhibition of cell cycle progression restores IR-induced invasion in cells lacking MRK or Chk2.

Conclusions:

  • Nbs1, MRK, and Chk2 constitute a novel signaling pathway controlling IR-induced glioblastoma cell migration and invasion.
  • Cell cycle progression negatively regulates glioblastoma cell invasiveness in the context of IR.
  • Checkpoint proteins mediate IR-induced invasive behavior by regulating cell cycle arrest.

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